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Changes in the atmospheric helium isotope ratio over the past 40 years Public Deposited

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  • We have compared the helium isotope ratio in five samples of Pacific marine air spanning the 40 year period between 1973 and 2013 against a secondary gas standard. In a separate experiment we directly compared the ³He/⁴He ratio in air samples collected in 1973 and 2013 at the same location in La Jolla, California, eliminating any geographical bias. Both experiments are consistent with zero time rate of change for atmospheric ³He/⁴He. Our best estimate for the rate of change of the ³He/⁴He ratio in Pacific marine air is -0.0014 ± 0.0045%/yr (2σ), indicating that air helium is still a valid standard for terrestrial helium isotope measurements.
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  • Lupton, J., and L. Evans (2013), Changes in the atmospheric helium isotope ratio over the past 40 years, Geophysical Research Letters, 40, 6271–6275. doi:10.1002/2013GL057681
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  • 40
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  • 23
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  • This work was supported by the NOAA Earth Ocean Investigations Program (formerly the NOAA Vents Program). This is PMEL contribution 4047.
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  • description.provenance : Submitted by Erin Clark (erin.clark@oregonstate.edu) on 2014-04-04T19:24:00Z No. of bitstreams: 1 LuptonJohnCEOASChangesAtmosphericHelium.pdf: 215037 bytes, checksum: a4f25f46ef1ba8419ee6eb7cfc6838ca (MD5)
  • description.provenance : Approved for entry into archive by Erin Clark(erin.clark@oregonstate.edu) on 2014-04-04T19:24:14Z (GMT) No. of bitstreams: 1 LuptonJohnCEOASChangesAtmosphericHelium.pdf: 215037 bytes, checksum: a4f25f46ef1ba8419ee6eb7cfc6838ca (MD5)
  • description.provenance : Made available in DSpace on 2014-04-04T19:24:14Z (GMT). No. of bitstreams: 1 LuptonJohnCEOASChangesAtmosphericHelium.pdf: 215037 bytes, checksum: a4f25f46ef1ba8419ee6eb7cfc6838ca (MD5) Previous issue date: 2013-12-03

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